[time-nuts] PCB design questions thread II
Chuck Harris
cfharris at erols.com
Mon Jun 2 21:05:09 EDT 2008
Bob Paddock wrote:
>>> 2. How many layers? In an ideal world with money no object, if I
>>> understand the current art correctly, I think I'd probably aim for a five
>>> layer
>
> I assume that is a typo? You can not have an odd number of layers.
> In this current 3D reality each layer has two sides. :-)
Sure you can. I have done 3 layer, 5 layer, and 7 layer boards.
Having done those, I will advise you not to do 3 layer, it warps. But
everything else is easily do able.
Multilayer boards are done by bonding together combinations of
1 side, 2 side, and 0 sided laminate. For instance:
4 layer can be made by:
2 side | 0 side | 2 side
1 side | 2 side | 1 side
1 side | 1 side | 2 side
...
5 layer can be made by:
2 side | 1 side | 1 side | 1 side
2 side | 0 side | 2 side | 1 side
2 side | 1 side | 0 side | 2 side
...
6 layer can be made by:
2 side | 0 side | 2 side | 0 side | 2 side
...
The only down side to odd numbers of layers is the supply house
has to stock 1 sided laminate.
-Chuck Harris
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